Ionic bonding

Worked examples (6)

• 1Define an ionic bond (Getting started)
• 2Describe the structure of an ionic compound (Getting started)
• 3Explain the high melting point (Building confidence)
• 4Conductivity in solid vs molten state (Building confidence)
• 5Explain why ionic crystals are brittle (Stretch)
• 6Conductivity across all three states (Stretch)

Model answers (6)

• ✓Model answer — 4WSD0/1C style
• ✓Model answer — 4WSD0/1C style
• ✓Model answer — 4WSD0/1C style
• ✓Model answer — 4WSD0/1C style
• ✓Model answer — 4WSD0/1C style — extended
• ✓Model answer — 4WSD0/1C style — extended

Worked examples (6)

• 1Formula of sodium chloride (Getting started)
• 2Formula of magnesium chloride (Getting started)
• 3Formula of sodium oxide (Building confidence)
• 4Formula from a transition-metal name (Building confidence)
• 5Formula of aluminium oxide (Stretch)
• 6Formula with two polyatomic ions and brackets (Stretch)

Model answers (6)

• ✓Model answer — 4WSD0/1C style
• ✓Model answer — 4WSD0/1C style
• ✓Model answer — 4WSD0/1C style
• ✓Model answer — 4WSD0/1C style
• ✓Model answer — 4WSD0/1C style — extended
• ✓Model answer — 4WSD0/1C style — extended

Worked examples (6)

• 1Define a covalent bond (Getting started)
• 2Count the shared pairs (Getting started)
• 3Decide covalent or ionic from the elements (Building confidence)
• 4Explain why a covalent bond is strong (Building confidence)
• 5Explain how a covalent bond forms in HCl (Stretch)
• 6Classify several substances and justify (Stretch)

Model answers (6)

• ✓Model answer — 4WSD0/1C style
• ✓Model answer — 4WSD0/1C style
• ✓Model answer — 4WSD0/1C style
• ✓Model answer — 4WSD0/1C style
• ✓Model answer — 4WSD0/1C style — extended
• ✓Model answer — 4WSD0/1C style — extended

Worked examples (6)

• 1Draw the dot-and-cross diagram for hydrogen, H₂ (Getting started)
• 2Draw the dot-and-cross diagram for hydrogen chloride, HCl (Getting started)
• 3Draw and explain the dot-and-cross diagram for water, H₂O (Building confidence)
• 4Draw the dot-and-cross diagram for carbon dioxide, CO₂ (Building confidence)
• 5Draw and justify the dot-and-cross diagram for nitrogen, N₂ (Stretch)
• 6Find the error in a given dot-and-cross diagram (Stretch)

Model answers (6)

• ✓Model answer — 4WSD0/1C style
• ✓Model answer — 4WSD0/1C style
• ✓Model answer — 4WSD0/1C style
• ✓Model answer — 4WSD0/1C style
• ✓Model answer — 4WSD0/1C style — extended
• ✓Model answer — 4WSD0/1C style — extended

Worked examples (6)

• 1Identify a simple molecular substance (Getting started)
• 2Why no electrical conductivity (Getting started)
• 3Explain the low melting point (Building confidence)
• 4Compare two molecular substances (Building confidence)
• 5Where the heat energy goes (Stretch)
• 6Use data to classify a structure (Stretch)

Model answers (6)

• ✓Model answer — 4WSD0/1C style
• ✓Model answer — 4WSD0/1C style
• ✓Model answer — 4WSD0/1C style
• ✓Model answer — 4WSD0/1C style
• ✓Model answer — 4WSD0/1C style — extended
• ✓Model answer — 4WSD0/1C style — extended